A Characteristic Signature of Magnetospheric Wave-Particle Interactions Found in the Turbulent E-region

TL;DR

This paper identifies a unique signature linking magnetospheric wave activity to subsequent plasma turbulence in the ionosphere, enhancing understanding of space weather interactions.

Contribution

It presents the first direct observational evidence connecting magnetospheric wave-particle interactions with ionospheric plasma turbulence.

Findings

Enhanced electrostatic cyclotron harmonic wave activity correlates with ionospheric turbulence.

A few seconds delay observed between magnetospheric waves and ionospheric response.

Close association demonstrated through conjugate radar and satellite data.

Abstract

Plasma waves in the magnetosphere scatter electrons, causing them to precipitate into Earth's atmosphere, imparting their temporal characteristics to diffuse auroras. In a case study of conjugate radar and satellite observations, we demonstrate a close and unprecedented association between enhanced electrostatic cyclotron harmonic wave activity in the magnetosphere and the appearance of meter-scale plasma turbulence a few seconds later in the lower ionosphere on nearby magnetic field lines. Such direct structuring of the ionosphere carries implications for our understanding of space weather.